isInteger($value, array $options = array()) checks if a given
string is a integer value and returns TRUE or
FALSE.
Example 559. Integer value testing
<?php
$locale = new Zend_Locale('de_AT');
if (Zend_Locale_Format::isInteger('13.445', array('locale' => $locale)) {
print "integer";
} else {
print "not a integer";
}